Steven James Matthew Price formed Affirmation: Gay Mormons United. (Later renamed Affirmation: Gay and Lesbian Mormons.) Members were encouraged to go by a middle name and mother's maiden name to keep their identities secret. (Price went by the name Matthew Price and later by Stephen J. Zacharias.) The mailing list of members was kept in a safe deposit box in Dallas. Within the year membership skyrocketed thanks to coverage in The Advocate. Affirmation marched in a Pride Parade for the first time in 1979 in Los Angeles.
[Source: Timeline of Mormon Thinking About Homosexuality, http://rationalfaiths.com/timeline-of-mormon-thinking-about-homosexuality/]